| Publication Date |
1973 |
| Personal Author |
Raff, R. A. V.; Subramanian, R. V.; Austin, H. F. |
| Page Count |
220 |
| Abstract |
The main objective of the investigations reported here was the development of suitable resin formulations based on commercially available polymeric resins which could be injected into the fissures and cracks in the roofs of coal mines to bond the rock and thereby reduce fatal rock falls. An extensive review of pertinent literature was made. The first phase of the research program was devoted to 'resin screening' in which over twenty commercial resins of the most common polymer types were evaluated. It became clear that only three classes of resins deserved further intensive studies. These were, the epoxy resins which showed the best potential of all, polyester resins, and resins from furfuryl alcohol. Injectability, mechanical properties, curing and aging properties, and chemical ingredients are discussed. In laboratory injections tests, the experimental epoxy resin formulations were found to penetrate minute cracks quite easily to seal cracks with strong bonds. Mine injection experiments were done. Detailed studies of the bonding of polymeric resins to shale by Mossbauer and infrared spectroscopy indicated that both primary bonds and hydrogen bonds between silicate and epoxy polymer contribute to the adhesive strength of epoxy resins in bonding to shale. Concurrently, a novel technique based on neutron radiography was also developed to determine the location of polymeric resins injected in rock fissures. |
| Keywords |
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| Source Agency |
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| NTIS Subject Category |
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| Corporate Authors |
Washington State Univ., Pullman. Dept. of Materials Science and Engineering.; BUREAU OF Mines, Washington, D.C. |
| Document Type |
Technical Report |
| Title Note |
Research rept. 1970-73. |
| NTIS Issue Number |
197512 |
| Contract Number |
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